Ultra Uint64 logic operations do not work

[Sarkoxed]

When using uint64 from stdlib and calling XOR or AND directly(not using create_logic_constraint):

#include "barretenberg/circuit_checker/circuit_checker.hpp"

#include "barretenberg/stdlib/primitives/field/field.hpp"
#include "barretenberg/stdlib/primitives/uint/uint.hpp"

using namespace bb;

namespace {
auto& engine = numeric::get_debug_randomness();
}

using field_t = stdlib::field_t<UltraCircuitBuilder>;
using witness_t = stdlib::witness_t<UltraCircuitBuilder>;
using pub_witness_t = stdlib::public_witness_t<UltraCircuitBuilder>;
using uint_t = stdlib::uint64<UltraCircuitBuilder>;

int main()
{
    UltraCircuitBuilder builder;

    uint_t a = witness_t(&builder, 0);
    uint_t b = witness_t(&builder, 0);
    uint_t c = a ^ b;
    info(c);
}

It returns the following error:

barretenberg/cpp/src/barretenberg/stdlib_circuit_builders/circuit_builder_base.hpp:107: FF bb::CircuitBuilderBase<bb::field<bb::Bn254FrParams>>::get_variable(const uint32_t) const [FF_ = bb::field<bb::Bn254FrParams>]: Assertion `(variables.size() > index)' failed.
[1]    1378769 IOT instruction (core dumped)  ./bin/xor_debug

[ledwards2225]

uint was removed